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Dry rot in a suspended timber floor

damp proofing accredited

In this first example, our clients had been having problems with dry rot in the suspended timber floor of their home for years. In time of rainfall water entered and flooded the sub floor void causing increased levels of dampness in the timber floor and wall structure and flooding to a depth of approximately 75mm.

Invasive investigation of dry rot in sub floor void, timber joists and floor boards. Works are often complicated by presence of services such as electric cables.
Invasive investigation of dry rot in sub floor void, timber joists and floor boards. Works are often complicated by presence of services such as electric cables.

Following a technical survey carried out by David, the root cause of water ingress and flooding was identified as coming from the following:

  • High water table and impermeable heavy clay sub soils.
  • Broken surface water gulley.
  • Broken surface and foul water drain.
  • Land drain from a neighbour’s property discharging ground water onto the land of our clients property near the building.
  • Patio at the rear of the property laid to incorrect falls directing surface water to the foundations.
Water ingress into sub-floor void caused by high water table, impermeable sub-soils and defective drainage. In this case the existing land drain has been installed by others many years ago at the incorrect height rendering it ineffective.
Water ingress into sub-floor void caused by high water table, impermeable sub-soils and defective drainage. In this case the existing land drain has been installed by others many years ago at the incorrect height rendering it ineffective.

Having correctly identified the root causes, Dryabode produced a schedule of works and the project began. The main works which we considered critical to the success of the project were as follows:

  • The broken gulley and drain were repaired.
  • Path down the side of the house reduced in level to correct height below the damp proof course to comply with British standards.
  • New land drain scheme with silt traps installed around the house with the drain at the correct level back filled with correct drainage stone in compliance with BS8102.
  • Patio at the rear re-laid to falls away from the house incorporating a linear gully along the length of the patio.
  • Surface water drainage runs re-configured to provide a more efficient system.

The outcome has been successful with the sub floor void completely dry and the dry rot outbreak has been successfully addressed.